| 1 | /* Disassemble moxie instructions. |
| 2 | Copyright (C) 2009-2020 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of the GNU opcodes library. |
| 5 | |
| 6 | This library is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | It is distributed in the hope that it will be useful, but WITHOUT |
| 12 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 13 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public |
| 14 | License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
| 19 | MA 02110-1301, USA. */ |
| 20 | |
| 21 | #include "sysdep.h" |
| 22 | #include <stdio.h> |
| 23 | |
| 24 | #define STATIC_TABLE |
| 25 | #define DEFINE_TABLE |
| 26 | |
| 27 | #include "opcode/moxie.h" |
| 28 | #include "disassemble.h" |
| 29 | |
| 30 | static fprintf_ftype fpr; |
| 31 | static void *stream; |
| 32 | |
| 33 | /* Macros to extract operands from the instruction word. */ |
| 34 | #define OP_A(i) ((i >> 4) & 0xf) |
| 35 | #define OP_B(i) (i & 0xf) |
| 36 | #define INST2OFFSET(o) (((((o) & 0x3ff) ^ 0x200) - 0x200) * 2) |
| 37 | |
| 38 | static const char * reg_names[16] = |
| 39 | { "$fp", "$sp", "$r0", "$r1", "$r2", "$r3", "$r4", "$r5", |
| 40 | "$r6", "$r7", "$r8", "$r9", "$r10", "$r11", "$r12", "$r13" }; |
| 41 | |
| 42 | int |
| 43 | print_insn_moxie (bfd_vma addr, struct disassemble_info * info) |
| 44 | { |
| 45 | int length = 2; |
| 46 | int status; |
| 47 | stream = info->stream; |
| 48 | const moxie_opc_info_t * opcode; |
| 49 | bfd_byte buffer[4]; |
| 50 | unsigned short iword; |
| 51 | fpr = info->fprintf_func; |
| 52 | |
| 53 | if ((status = info->read_memory_func (addr, buffer, 2, info))) |
| 54 | goto fail; |
| 55 | |
| 56 | if (info->endian == BFD_ENDIAN_BIG) |
| 57 | iword = bfd_getb16 (buffer); |
| 58 | else |
| 59 | iword = bfd_getl16 (buffer); |
| 60 | |
| 61 | /* Form 1 instructions have the high bit set to 0. */ |
| 62 | if ((iword & (1<<15)) == 0) |
| 63 | { |
| 64 | /* Extract the Form 1 opcode. */ |
| 65 | opcode = &moxie_form1_opc_info[iword >> 8]; |
| 66 | switch (opcode->itype) |
| 67 | { |
| 68 | case MOXIE_F1_NARG: |
| 69 | fpr (stream, "%s", opcode->name); |
| 70 | break; |
| 71 | case MOXIE_F1_A: |
| 72 | fpr (stream, "%s\t%s", opcode->name, |
| 73 | reg_names[OP_A(iword)]); |
| 74 | break; |
| 75 | case MOXIE_F1_AB: |
| 76 | fpr (stream, "%s\t%s, %s", opcode->name, |
| 77 | reg_names[OP_A(iword)], |
| 78 | reg_names[OP_B(iword)]); |
| 79 | break; |
| 80 | case MOXIE_F1_A4: |
| 81 | { |
| 82 | unsigned imm; |
| 83 | if ((status = info->read_memory_func (addr + 2, buffer, 4, info))) |
| 84 | goto fail; |
| 85 | if (info->endian == BFD_ENDIAN_BIG) |
| 86 | imm = bfd_getb32 (buffer); |
| 87 | else |
| 88 | imm = bfd_getl32 (buffer); |
| 89 | fpr (stream, "%s\t%s, 0x%x", opcode->name, |
| 90 | reg_names[OP_A(iword)], imm); |
| 91 | length = 6; |
| 92 | } |
| 93 | break; |
| 94 | case MOXIE_F1_4: |
| 95 | { |
| 96 | unsigned imm; |
| 97 | if ((status = info->read_memory_func (addr + 2, buffer, 4, info))) |
| 98 | goto fail; |
| 99 | if (info->endian == BFD_ENDIAN_BIG) |
| 100 | imm = bfd_getb32 (buffer); |
| 101 | else |
| 102 | imm = bfd_getl32 (buffer); |
| 103 | fpr (stream, "%s\t0x%x", opcode->name, imm); |
| 104 | length = 6; |
| 105 | } |
| 106 | break; |
| 107 | case MOXIE_F1_M: |
| 108 | { |
| 109 | unsigned imm; |
| 110 | if ((status = info->read_memory_func (addr + 2, buffer, 4, info))) |
| 111 | goto fail; |
| 112 | if (info->endian == BFD_ENDIAN_BIG) |
| 113 | imm = bfd_getb32 (buffer); |
| 114 | else |
| 115 | imm = bfd_getl32 (buffer); |
| 116 | fpr (stream, "%s\t", opcode->name); |
| 117 | info->print_address_func ((bfd_vma) imm, info); |
| 118 | length = 6; |
| 119 | } |
| 120 | break; |
| 121 | case MOXIE_F1_AiB: |
| 122 | fpr (stream, "%s\t(%s), %s", opcode->name, |
| 123 | reg_names[OP_A(iword)], reg_names[OP_B(iword)]); |
| 124 | break; |
| 125 | case MOXIE_F1_ABi: |
| 126 | fpr (stream, "%s\t%s, (%s)", opcode->name, |
| 127 | reg_names[OP_A(iword)], reg_names[OP_B(iword)]); |
| 128 | break; |
| 129 | case MOXIE_F1_4A: |
| 130 | { |
| 131 | unsigned imm; |
| 132 | if ((status = info->read_memory_func (addr + 2, buffer, 4, info))) |
| 133 | goto fail; |
| 134 | if (info->endian == BFD_ENDIAN_BIG) |
| 135 | imm = bfd_getb32 (buffer); |
| 136 | else |
| 137 | imm = bfd_getl32 (buffer); |
| 138 | fpr (stream, "%s\t0x%x, %s", |
| 139 | opcode->name, imm, reg_names[OP_A(iword)]); |
| 140 | length = 6; |
| 141 | } |
| 142 | break; |
| 143 | case MOXIE_F1_AiB2: |
| 144 | { |
| 145 | unsigned imm; |
| 146 | if ((status = info->read_memory_func (addr+2, buffer, 2, info))) |
| 147 | goto fail; |
| 148 | if (info->endian == BFD_ENDIAN_BIG) |
| 149 | imm = bfd_getb16 (buffer); |
| 150 | else |
| 151 | imm = bfd_getl16 (buffer); |
| 152 | fpr (stream, "%s\t0x%x(%s), %s", opcode->name, |
| 153 | imm, |
| 154 | reg_names[OP_A(iword)], |
| 155 | reg_names[OP_B(iword)]); |
| 156 | length = 4; |
| 157 | } |
| 158 | break; |
| 159 | case MOXIE_F1_ABi2: |
| 160 | { |
| 161 | unsigned imm; |
| 162 | if ((status = info->read_memory_func (addr+2, buffer, 2, info))) |
| 163 | goto fail; |
| 164 | if (info->endian == BFD_ENDIAN_BIG) |
| 165 | imm = bfd_getb16 (buffer); |
| 166 | else |
| 167 | imm = bfd_getl16 (buffer); |
| 168 | fpr (stream, "%s\t%s, 0x%x(%s)", |
| 169 | opcode->name, |
| 170 | reg_names[OP_A(iword)], |
| 171 | imm, |
| 172 | reg_names[OP_B(iword)]); |
| 173 | length = 4; |
| 174 | } |
| 175 | break; |
| 176 | case MOXIE_BAD: |
| 177 | fpr (stream, "bad"); |
| 178 | break; |
| 179 | default: |
| 180 | abort(); |
| 181 | } |
| 182 | } |
| 183 | else if ((iword & (1<<14)) == 0) |
| 184 | { |
| 185 | /* Extract the Form 2 opcode. */ |
| 186 | opcode = &moxie_form2_opc_info[(iword >> 12) & 3]; |
| 187 | switch (opcode->itype) |
| 188 | { |
| 189 | case MOXIE_F2_A8V: |
| 190 | fpr (stream, "%s\t%s, 0x%x", |
| 191 | opcode->name, |
| 192 | reg_names[(iword >> 8) & 0xf], |
| 193 | iword & ((1 << 8) - 1)); |
| 194 | break; |
| 195 | case MOXIE_F2_NARG: |
| 196 | fpr (stream, "%s", opcode->name); |
| 197 | break; |
| 198 | case MOXIE_BAD: |
| 199 | fpr (stream, "bad"); |
| 200 | break; |
| 201 | default: |
| 202 | abort(); |
| 203 | } |
| 204 | } |
| 205 | else |
| 206 | { |
| 207 | /* Extract the Form 3 opcode. */ |
| 208 | opcode = &moxie_form3_opc_info[(iword >> 10) & 15]; |
| 209 | switch (opcode->itype) |
| 210 | { |
| 211 | case MOXIE_F3_PCREL: |
| 212 | fpr (stream, "%s\t", opcode->name); |
| 213 | info->print_address_func (addr + INST2OFFSET (iword) + 2, info); |
| 214 | break; |
| 215 | case MOXIE_BAD: |
| 216 | fpr (stream, "bad"); |
| 217 | break; |
| 218 | default: |
| 219 | abort(); |
| 220 | } |
| 221 | } |
| 222 | |
| 223 | return length; |
| 224 | |
| 225 | fail: |
| 226 | info->memory_error_func (status, addr, info); |
| 227 | return -1; |
| 228 | } |